Telephone and telegraph relay or repeater.



J. H. CUNTZ. v TELEPHONE AND TELEGRAPH RELAY 0R REPEATER.

APPLICATION FILED AUG-10.1912- Patented Feb. 13, 1917.

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JOHN H. CUNTZ, 0F HOBOKEN, NEW JERSEY.

1,215,348. r Original application filed February-19,

Be it known that I, JOHN H. CUNTZ, a citizen of the United States, and resident of oboken, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Telephone and Telegraph Relays 'or Repeaters, of which the following is a specification, reference being had to the accompanying drawings, forming a part hereof, this being a divisional case of my application Serial No. M4434, filed February 19, 1903.

his invention relates to means for relaying or repeating telephone and telegraph messages. Telephone repeating coils have been used in which there are two windings, a primary and a secondary, variations in the current through one inducing a varying cur- But although such coils are of service for certain purposes in telebeen found helpfill in extending the distance over which telephonic speech may be transmitted.

In my relay, or repeater, in addition to the primary and secondary coils, connected, respectively, to the incoming and outgoing line circuits, I use another coil insulated from the two former and in circuit with an inde pendent source of current.

In one form of this relay the coils are wound around an iron core and a continuous current is passed through the third, or auxiliary coil, of such a strength that the magnetic field due to it will cause the iron of the core to be at, or about, the point of maximum permeability. It. is the permeability of iron varies with the strength of the magnetic field in which it is placed. At low magnetizations, such as are state where small variations in the current of the primary coil will cause comparatively great changes to occur in the iron of the core, and, hence, in the in secondary coil. The rentin the secondary variations of the curco1l and in the lme 011'- Specification 9; Letters Patent;

should ,have a smooth well known that duced currents of the are superposed upon TELEPHONE AND TELEGRAPH RELAY OR REPEATER.

Patented Feb. is, 1917. and this application filed August in the primary current will cause comparatively great changes in the magnetic state of t c core, which changes will induce corresponding variations in the current of the secondary coil, and of the line circuit to which it is connected. For telephone purposes this alternating current should be of a frequency below the limit of audibility, and wave form, without angles or sudden changes and'breaks which but will have a greater would cause sounds in the telephone. And I whenever the alternating current is used for. the purposes here indicated, it should preferably have a very low frequency, just great enough to keep the magnetlc particles of the iron in motion, and not so hi h as to cause any deleterious effects. nating current in the auxiliary coil will, of course, induce corresponding currents in the primary and secondary coils and hence in the line wires, but these currents will not produce hurtful effects if the frequency is low enough. There will be on the line an alternating current having a very long period and smooth wave form, on which will be superposed the telephonic and telegraphic currents like'little ripples on an ocean ground swell, as indicated in Figure 7.

For some purposes I prefer to have the alternating current of as will produce a magnetic field which causes the average state of the iron to be at or near that of maximum permeability.

In certain cases itis advantageous for the iron core to form a closed magnetic circuit, and I then make my iron core in the shape of a ring or in some other suitable form. The core is composed preferably of fine Wires of iron possessing high permeability and a low hysteresis coefficient.

7 When the coils are used Without an iron core, the variations in the primary current inducecurrents in the auxiliary coil which the normal current,

This slowly altera mean strength such lOO auxiliary coil nating current.

either continuous .or alternating, passing through the auxiliary coil. The so-varying auxiliary current will then induce currents in the secondary coil, which will have a greater intensity than those in the primary coil, although similar in form.

Besides being of service in telephone work, my relay or repeater is adapted to telegraph Workyand, particularly, to submarine teleg:

'raphy, where the currents are very feeble.

My relay or repeater will transmit messages in either direction equally well,1 and,

secon ary the primary coil can act as a coil, and the secondary coil as a primary, with equal facility. The names primary 'and secondary are used in these specifications for the sake of clearness.

In the accompanying drawings: I

Fig. 1 represents a relay or repeater with a ring-shaped iron core, about which are wound a primary cell, connected to the in coming line Wires, a secondary coil, connected to the outgoing line wires, and an auxiliary coil connected to an independent source of alternating current.

Fig. 2 represents a relay or repeater with a -ring-shaped iron core, the primary an secondary coils being as in Fig. 1, but the being here connected to an independent source of continuous current.

Fig. 3 represents a relay or repeater with a straight iron core, the primary, secondary and auxiliary coils being connected as in Fig. 1, theauxiliary coil, as shown, being in circuit with an independent source of alter- Fig. e represents a relay or repeater in which the primary and secondary coils are wound on separate iron cores, the auxiliary coil being in two parts, one wound on the same core with the primary coil, the other 'part wound on the same core with the secondary coi The auxiliary coil, as shown, is in circuit with an independent source of continuous current, but it may also be in circuit with a source of alternating current.

Fig. 5 represents a relay or repeater in which the coils are arranged and connected as in Fig. 4:, but in which there are no iron cores.

Fig. 6 represents telegraphic system submarine work.

Fig. 7 is a curve representing an alternating current wave of Very long period, or low frequency, with shorter current waves, of higher frequency, such as occur in telephone and telegraph work, upon it. v

In Fig. 1, M is an iron or steel ring composed, preferably, of thin, iron wires, on which are wound: a primary coil, P, in circuit with the line wires, 15, t,"and the telephone transmitter, T, a secondary coil, S, in circuit with the line Wires, 4, i", and the a relay or repeater in a such as may be used n core' composed, preferably,

telephone superposed graphic: receiving apparatus,

being completed through posed, preferably, of thin iron wires, on

' which are wound: a primary coil, P, in cirzcult with the line wlres t,

15, and the telephone transmitter, a secondary coil, S, in circuit with the line wires 7,- 1", and the telephone receiver, R; and the auxiliary coil, Q, in circuit with the source of continuous current, H. I

In Fig. 3, M is an iron or steel straight of thin iron Wires, on whichare woundz a primary coil, I, in circuit with the line wires, 1?, t, and the transmitter, T; a secondary coil, S, in circuit with the line wires, 7", 7", and the telephone receiver, R; and the auxiliary coil, Q, in circuit with'the source of alternating current, G.

In Fig. 4c, M, is an iron or steel core which is here shown straight, but may also be of any other shape, and which is composed, preferably, of thin iron wires, on which are wound: a primary coil, I, in circuit with the line wires, t, t, and the;.telephone transmitter, T; andan auxiliary coil, Q 1n circuit with another auxiliary coil", Q and a source of continuous current, H. M, is an iron or steel core which is here shown straight, but ay also be of any other shape,

and which is composed, preferably, of thin but in close proximity thereto, or wound about. it, and in circuit with another auxiland a source of current,

iary coil, Q

S is a secondary 0011, also without any iron or stel core, in circuit with the line wires,

1", r, and the telephone receiver, R. an auxiliary coil, insulated from S, but in close proximity thereto, or wound about it, in circuit with a source of current, II, which is here shown as continuous, but may also be alternating.

In Fig. 6, M is a core of iron or steel, but preferably composed of thin iron wires, on which are wound: a primary coil, 1 in circuit with the line wire, In, and the telegraphic transmitting apparatus, K, the circuit beingjcompleted through the earth connections 4 1 and E,; a secondary coil, S, in circuit with the :line wire, Z, and the teletions E and E and an auxiliary coil, Q,

M is an iron or steel ring. com-' g. 5, P is a primary coil, without any L, the circuit I the earth connec Q, is 1 ,7

. iron core, from each may in circuit with a source of alternating current Gr.

In Fig; 7,1 1, A, A is a curve representing wave of a very long superposed high-fretelegraphic currents,

period, on which are quency telephonic or shown at a, h and c.

All of the coils, l, S and Q, mentioned in these specifications, are insulated from the own turns. I

. In all the figures, the'primary coil, P, will act asa, secondary coil,'and the secondary coil, S, will act as aprimary coil when the direction (sf-transmission is reversed, and will act thus-equally well as before; they have beenshown in the figures as designated for the sake of clearness. Also, for the salie of clearness, the coils have been shown, in all the figures, as occupying separate portions of the core, but they may equally well be wound over each other in lay-' ers,properly insulated from each other, and be in two or more sections, properly connected. H

For transmitting in both directions, the number of turns of the primary and secondary -coils are preferably equal. When continuous current is used in the auxiliary 'coil, the strength of the current and the number of turns of the coil should-be so proportioned, that a magnetic field created of an intensity such that the iron of the core will be at or about its state of maximum permeability. Y

When an alternating current is used, the

vfrequency should other and between their and co ls in circuit with will be preferably be and for telephonic the limits of audibility.

In general, the figures are diagrammatic, and show the objects described in conventional form, and I do not confine myself to the exact constructions here indicated, but what I here claim as my invention and desire to secure by Letters Patent is:

A relay or repeater, including a plurality of auxiliary coils, through which is flowing current from an independent source, the line Wires and m inductive relation, to the auxiliary coils.

2. A rel dependent source of direct current, a plurality of iron cores, a plurality of 'auxiliary coils one on each core, through which flows a direct current from said source, and a plurality of coils in circuit with the linc Wires each in inductive relation to one of the auxiliary coils and to the iron cores.

relay or repeater, rality of auxiliary coils, through which is flowing direct current from an independent source, and coils in circuit very low,- purposes must be below ay or repeater, including fan in-' including a pluwith the line wires and in inductive relation tothe .auxil- I iarycoils. I

In testimony whereof, I-have slgred my name to this specification, in the presence of two subscribing witnesses, this 8th day of August, 1912. I

JOHN H. CUNTZ. Witnesses:

HERMAN F. GUNTZ, H. MUcH oRn. 

